With the explosive growth of wireless devices, exponentially increased bandwidth is required to support a variety of high data-rate services.
Consequently, spectrum resources have been increasingly scarce, which motivates the development of advanced spectrum sharing technologies [1]}.
Since large portions of the spectrum are available at radar frequency bands, spectrum sharing between radar and communication systems has led to substantial research interest [2]}-[3]}.
This line of research is referred to as integrated sensing and communication (ISAC), which is also known as joint radar-communication (JRC), joint communication and radar (JCR), joint communication and radar sensing (JCAS), etc.
ISAC allows radar and communication systems to share the same spectrum bands, which can significantly improve the spectrum efficiency and thus alleviates the spectrum congestion problem.
It is foreseeable that ISAC will become a critical enabling technology for future wireless networks, supporting various vital applications, including vehicular networks [4]}, Internet of Things (IoT) [5]}, etc.
